Four-stroke chain saws perform better in many ways. First of all, the four-stroke chain saw is more environmentally friendly and has less waste gas pollutants, which meets the requirements of modern environmental protection. Secondly, the four-stroke chain saw is more economical to use and has better fuel economy, which can save the use cost. Thirdly, the four-stroke chain saw has less noise, which will reduce noise interference during use. Fourthly, the four-stroke chain saw has lower maintenance cost and longer service life, and can provide more stable and lasting performance. In addition, the lubrication system of the four-stroke chain saw is more precise, and the use cost of lubricating oil is lower, which can better protect the engine. To sum up, the four-stroke chain saw is superior to the two-stroke chain saw in environmental performance, economy, noise control, maintenance cost and service life.