Several factors which influence the purchase of machinery are analyzed in this paper, and it is considered that the construction output value is the most important factor.

Prevention to the phenomenon of the division of bids implementing authentication and construction production;

This paper put forward a checking method to calculate construction deflection value according to the strength growing rule of semi-rigid base with its age, and verifies its engineering practicability with an example.

Efficiency-based impulse response analysis between industrial output and wastewater effluent;