There has never been achieved before in the Moldavian private international law a complex scientific research regarding the law applicable to the material and formal validity conditions of the juridical act, by using laws, opinions from doctrine and court case experience, as well as proposing the lining up of the Moldavian legislation to the European regulations. This study establishes the difference between the law applicable to the juridical act and to the contract, as well as between the law applicable to the material conditions and to the formal conditions. It contains an analysis of lex voluntatis, the law of the state to which the juridical act is most closely connected to, locus regit actum rule, lex actus application field, lex succesionis conflict of law rule, locus regit actum, lex patriae, lex domicilii and auctor regit actum conflict of law rules character and their application area. The possibility of achieving the splitting up in the Moldavian private international law is substantiated. The study can be used as a manual at the Private international law discipline of the Law Faculties, to perfect the specialists in this area, but also for the law projects.