Among them the biggest user that project machine is hydraulic pressure product, 42.3% what hold industry sale, scale still will expand henceforth, the development tendercy of project machine is so crucial. According to predicting, to 2010 hydraulic pressure grab year demand amounts to 60 thousand ~8 about 10 thousand, bulldozer (120 horsepower above) nearly 10 thousand, fork-lift truck makes an appointment with 100 thousand ~12 10 thousand, land leveler makes an appointment with 2000, roller makes an appointment with 15 thousand, construction crane makes an appointment with 20 thousand, forklift makes an appointment with 80 thousand, the cement mixer is close 10 thousand. In addition, our country has project machine to make an appointment with 1.4 million now, predict to achieved 2 million 2010. Additional all, the fluid casting die that the place of form a complete set such as machinery of the excavator that produces every year for domestic company, road, cement mixer imports, amount to above of 150 million dollar about. Anyhow, for project machine form a complete set, maintenance uses the market of hydraulic pressure and weather strip to will face the new period of great progress.