In view of the apportioned problem of shared built-up area in the calculation of buildings area, writer is on the basis of work practice, illustrating the significance of shared ways, and applealing the department concerned for attaching importance to it and perfecting the original norm.

Apportioned computation and analysis on the shared construction area of multifunction building;

So construction area calculating methods could not exchange, which should be paid attention especially of the project estimation, between construction and real estate industry.

In order to improve the accuracy of house construction cost budgetary estimate during the feasibility research, the unitary linearity regress method is used to study the linearity relationship between project amount and construction area.

This paper introduces the concepts and functions of the floor area,and makes the comparison of the new standard and old regulation in calculating the floor area of the building works.

The floor area ratio for every grid cell has been computed through the analysis of the linear relationship between the percent of the building shadows area from building land and the floor area ratio in investigating grid cell.

Building size, floor area and other factors should be taken into account.