Can economic disputes in construction projects be put on file only by contract without other evidence?

It is best to provide relevant evidence.

People's Republic of China (PRC) Civil Procedure Law

Part II Trial Procedure

Chapter XII General Procedure of First Instance

Section 1 Prosecution and Acceptance

Article 119

Prosecution must meet the following conditions:

(1) The plaintiff is a citizen, legal person and other organization that has a direct interest in the case;

(2) Having a clear defendant;

(3) Having specific requests, facts and reasons;

(4) It falls within the scope of civil litigation accepted by the people's court and is under the jurisdiction of the sued people's court.

Article 120 A complaint shall be submitted to the people's court, and copies shall be submitted according to the number of defendants.

If it is really difficult to write a complaint, it can be made orally, which will be recorded by the people's court and the other party will be informed.

Article 121 A complaint shall contain the following items:

(1) The name, sex, age, nationality, occupation, work unit, domicile and contact information of the plaintiff, the name and domicile of the legal person or other organization, and the name, position and contact information of the legal representative or principal responsible person;

(2) Information such as the name, gender, work unit and domicile of the defendant, and information such as the name and domicile of the legal person or other organization;

(3) the request and the facts and reasons on which it is based;

(4) Evidence and its sources, names and residences of witnesses.