[Mekanisme sistem hidrolik Controllable Pitch Propeller berperan penting dalammengatur dan mempertahankan sudut pitch, sehingga sistem hidrolik pada CPPpenting untuk dipelajari. Namun, masih jarang ditemui literatur atau penelitianyang membahas masalah ini. Penelitian ini akan merancang mekanisme sistemhidrolik CPP serta mensimulasikannya dengan menggunakan MATLAB.Mekanisme sistem hidrolik terdiri dari komponen utama berupa pompa,directional control valve, sistem perpipaan, aktuator dan komponen pendukungberupa pressure reliefe valve dan load sensing. Aktuator pada sistem inimentransmisikan gerak translasi menjadi rotasi. Hasil simulasi didapatkankarakteristik tekanan diferensial dan pompa, volume, buka-tutup katup dan debitaliran serta gerak aktuator. Sistem hidrolik ini mampu mengubah sudut αmaksimum 33o dalam waktu 12 detik., Mechanism of hydraulic system of Controllable Pitch Propeller had an importantrole to settle and defend the pitch angle, therefore the hydraulic system on CPP isan important to learn. However, it is still rare literature or research that addressesthis issue. This research will design a hydraulic system mechanism CPP andsimulating it by using MATLAB. Mechanism hydraulic system consists of themain components in the form of pump, directional control valve, piping systemsand actuator, and supporting components form pressure reliefe valve and loadsensing. The actuator in this system transmitted the translational motion intorotational motion. The simulation results obtained characteristics of differentialpressure and pump, volume, open-close valve, flow and motion actuators. Thehydraulic system is capable of changing the angle α 33o maximum within 12seconds.]