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Objectives To explore the basic heart functional state and cardiac reserve function of patients with different types of unstable angina pecto ris (UAP) and observe the relations between the heart function and severity of coronary arterial disease. Methods 70 eases with UAP were enrolled including 25 patients with angina decubitus (AD), 23 patients with mixed angina (MA) , and 22 patients with accelerated effort angina (AEA). All patients underwent a series of examination such as UCG, ECT, hemodynamics and volume-loading test. The patients were divided group. We assessed the basic heart function and cardiac reserve function of patients with different types of UAP and also observed the relations between coronary (48%). 43 percent of the patients with mixed angina had systolic dysfunction and other 43 percent of them had normal cardiac function. However, patients with nary capillary wedge pressure of positive patients rose,at the same time cardiac index fell to the extreme instantaneously after loading in volume-loading test and then they restored to the basic level until 60 minutes.However, both PCWP and CI of the negative patients arteriography show: there are 41% of patient with three-vessel disease, 50% with two-vessel disease,9% single vessel disease and left main narrowing 22.7% in AEA. There are separately 76%, 24%,were separately compared with AD, AEA/AD: P ＜ 0. 05(P = 0.031); MA/AD: P ＜ 0.01 (P = 0. 000313). Conclusions Most of patients with the above three types of unstable angina pectoris suffered from the basic heart dysfunction and cardiac reserve dysfunction which might participate in the occurrence and development of unstable angina pectoris. In angiography, there are the most three-vessel diseases in AD that are, therefore, the most severe UAP.