黑白合同是为了规避相关部门的监管,建设单位表面上和施工企业签订一份合理的施工造价合同(白合同),背地却在压低价格后与施工企业另签一份合同(黑合同)。黑白合同大量产生的原因:一方面,建筑市场是卖方市场,施工企业供大于求,企业急于承揽工程项目,只好接受建设单位条件苛刻的 Black and white contract is to avoid the supervision of relevant departments, on the surface of construction units and construction companies signed a reasonable construction cost contract (white contract), but in the back of the lower prices and construction companies signed a separate contract (black contract). Black and white contract a large number of reasons: on the one hand, the construction market is the seller’s market, construction companies oversupply, enterprises rush to contract projects, had to accept the harsh conditions of the construction unit