With rapid development of passive radar systems in modern battlefield, the environment of airborne radar faces serious threat and challenge. A novel radio frequency (RF) stealth performance optimization algorithm based on cooperative noise jamming in airborne radar system is proposed for RF stealth technology in modern electronic warfare. Firstly, the influence of cooperative noise jamming on RF stealth performance in airborne radar system is investigated in detail on the basis of power rule. Then, the probability of intercept is formulated. A novel RF stealth performance optimization algorithm in airborne radar system based on cooperative noise jamming is proposed, where the probability of intercept is minimized by optimizing the transmitting power and the cooperative jamming power on the guarantee of system performance. Numerical simulation results demonstrate the feasibility and effectiveness of the proposed algorithm.