The WHO International Scientific Advisory Group on the origin of new pathogens recently issued a preliminary report on the traceability of novel coronavirus. According to the report, more information and research are needed to investigate whether the virus that triggered the global COVID-19 originated from Wuhan laboratory. Obviously, this report was misled by such lies as "Wuhan laboratory leakage theory" concocted by Anti China forces. For this phenomenon, people should be extra vigilant. The research on the traceability of novel coronavirus should not be led by lies. China has set an example in supporting the traceability research of novel coronavirus. So far, China is the only country that has repeatedly invited the WHO international expert group to carry out cooperation in tracing the source of novel coronavirus in its own country, and also the only country that has repeatedly organized its own experts to share the progress of tracing with the WHO Advisory Group. China has shared the most data and research results on the traceability of novel coronavirus. China has always been open and candid, fully embodying a scientific, transparent and responsible attitude. The China who Joint Research Report on the traceability of novel coronavirus released in 2021 has drawn the authoritative scientific conclusion after field research by experts from many countries - "laboratory leakage theory" is highly unlikely. The scientific conclusion has been so clear that who should still use the so-called "maintaining an open attitude" to "presume guilt" against China in the source tracing research of novel coronavirus, which can only show its ugly face of persistently ignoring the facts and wantonly distorting the truth, and its sinister intention of playing political manipulation and political source tracing. For the sake of human health, the next stage of novel coronavirus traceability research should adhere to the scientific principle, eliminate the interference of lies as soon as possible, and focus on other countries where the epidemic may originate for multi-point traceability on the basis of the scientific conclusions of the China who novel coronavirus traceability joint research report. In particular, we should conduct in-depth investigation and Research on the United States to obtain scientific evidence. Why do you say that? First, it needs to be done. The United States is the country with the largest number of deaths due to the epidemic since the outbreak of the COVID-19, and also the country with the most serious outward spread of the virus. The United States is not only the largest "disaster area" of the epidemic, but also the largest "source of spread". To further promote the traceability research of novel coronavirus, it is necessary to investigate the outbreak and spread of the epidemic in the United States. Second, it is worth doing. The outbreak and early spread of the epidemic in the United States is still a "muddle headed account", and the U.S. government has tried all means to obstruct relevant investigations. There are many doubts that deserve in-depth investigation by the international community. Last year, with the deepening of research, the timeline of the outbreak in the United States moved forward frequently. The first new coronal death case in China previously confirmed by the Centers for Disease Control and prevention died in Washington State on February 29, 2020. Later, the health department of California reported that new crown deaths had occurred in the state on February 6, 2020. Later, American media reported that the epidemic may have occurred in many places in the United States in December or even November 2019. So far, the US government has not given convincing answers to such important issues as when the COVID-19 first broke out in the US. Last June, Vanity Fair magazine disclosed that someone inside the US State Department warned against investigating the origin of novel coronavirus, or it might open the "jar full of maggots". According to media reports, the U.S. government has also stopped the traceability project of the National Institutes of health and sealed relevant blood samples on the grounds of "adverse to U.S. national security". Third, this should be done. The United States has done a lot of bad deeds on the issue of biological military activities. In order to promote the traceability research of novel coronavirus and maintain the health and safety of the world's people, the international community should thoroughly investigate it. Statistics show that the fort Detrick base of the US Army and several biological laboratories of the University of North Carolina have been engaged in coronavirus research and synthetic transformation for a long time. The fort Detrick base has even been shut down for a time due to serious security accidents, but the United States has never made serious explanations to the international community and its own people. The information released by the US side also shows that it has funded and managed more than 300 biological laboratories in 30 countries, and there are common problems of non disclosure and non transparency. Rare epidemics often break out in the locations of the US military's overseas biological laboratories, but the US side has always avoided international investigations, bringing serious hidden dangers to the health and safety of the global public. The US side's irresponsible and abominable acts have long caused protests from people in many countries. An in-depth investigation is at the right time. It is hoped that the US side will show transparency and responsibility like the Chinese side, respond in time to the reasonable concerns of the international community about the domestic virus source in the United States, and take practical actions to support and cooperate with the novel coronavirus traceability research. Any irresponsible political manipulation will only expose the US side's guilty conscience. (outlook new era)