In July of this year, the latest version upgraded and modified from the "Lecler" main battle tank, the "Lecler" XLR tank, was unveiled, and the French Army defined it as the fourth generation main battle tank. This is not the first appearance of the "Lecler" XLR tank. Last year at the 27th European (Paris) International Defense Exhibition and the 2019 Abu Dhabi International Defense Exhibition, French company Nexter showcased it. As a "refurbished" product based on the previous generation of tanks, the "Lecler" XLR tank can be described as a "facelift". With the support of advanced concepts and technology, its performance has been improved in multiple aspects. In recent years, with the use of tanks in military conflicts in hot areas and the dissemination of combat videos online, their status and role have once again sparked heated discussions. What is the significance of the development and debut of the "Lecler" XLR tank? How is its performance and combat effectiveness? To what extent can the characteristics of the fourth generation tank be reflected? Please refer to the interpretation of this issue. France's upgrade and modification of the "Lecler" main battle tank - a new attempt in the development of the fourth generation tank - Cheng Chunlei, Chen Hong, Cao Shikai, and the "Lecler" main battle tank. The number of "nemesis" in the information picture has increased, and the difficult to block tanks continue to upgrade. Tanks are known as the "king of land warfare". Since its inception, various military powers have invested a large amount of funds in the development and installation of tanks. With the evolution of war forms, there are more and more "enemies" of tanks. Especially in recent years, in several military conflicts in hot areas, some well-known main battle tanks have been frequently destroyed. The emergence of drones as a new 'natural enemy' has further questioned the battlefield viability of tanks. In fact, the relationship between tanks and anti tank weapons is inherently one of "ebb and flow". In several previous wars, tanks have also been heavily killed by "enemies" such as anti tank missiles. However, most countries have not stopped developing and installing tanks as a result, which to some extent indicates that the role of tanks is still irreplaceable. The threat posed to tanks by new "natural enemies" such as drones and cruise missiles has sparked some doubts from the outside world, believing that the status and role of tanks have declined. But in fact, with the completion of new research or modification tank projects in some countries, their numbers are still increasing. Not long ago, the Polish Defense Minister announced that they had agreed to purchase a batch of K2 main battle tanks from South Korea. In addition, the country has plans to purchase 250 M1A2C main battle tanks. Some countries have joined the ranks of upgrading and renovating active tanks, and developing new tanks. Germany and France have launched the "Major Ground Combat System" MGCS project, working together to create a new generation of tanks; Germany's Rhine Metal Company has launched the KF51 "Panther" tank; The Italian Army Weapons Agency has signed a contract with a joint venture consisting of Iveco and Leonardo to upgrade the Italian Army's "Ram C1" main battle tank to "Ram C2"; Although the British Army once stated that it would replace some main battle tanks with the "Ajax" heavy infantry tank, in the new situation, the project to upgrade and develop the "Challenger 2" main battle tank has been launched. The actual actions of various countries have proven that tanks are still the main force on the ground battlefield