The first, the building is collected the branch is collected what the person concludes to collect compensation agreement to disable with what do not have civil action capacity; The 2nd, collect branch and do not collect compensation agreement to disable in what collect the party inside limits to conclude; The 3rd, collect ill will of compensation agreement party to collude with, damage country, collective or of interest of the 3rd person, the agreement is invalid; The 4th, the conceals illegal destination with legal form agreement that imposes compensation agreement party to conclude is invalid.