Abstract: THE ORDOVICIAN-CAMBRIAN THERMAL RESERVOIR IS ONE OF THE DOMINANT THERMAL RESERVOIRS IN THE HEBEI PLAIN, AND IT OF GREAT GUIDING SIGNIFICANCE FOR FUTURE DEVELOPMENT AND UTILIZATION TO STUDY THE DISTRIBUTION CHARACTERISTICS OF ITS WATER ABUNDANCE. ON THE BASIS OF SYSTEMATIC ANALYSIS OF THE SEDIMENTARY ENVIRONMENT OF THE CRETACEOUS AND ORDOVICIAN THERMAL RESERVOIRS IN THE HEBEI PLAIN, THE OF PALEOGEOMORPHOLOGY, THE EVOLUTION OF FAULT TECTONIC PATTERN AND BURIAL, ETC., THE COMPARATIVE RESEARCH AND CORRELATION ANALYSIS ARE USED TO REVEAL THE REGULARITY AND INFLUENCING FACTORS THE WATER ABUNDANCE OF THE CRETACEOUS AND ORDOVICIAN THERMAL RESERVOIRS IN THE HEBEI PLAIN.. THE RESULTS SHOW THAT THE WATER OF THE ORDOVICIAN-CAMBRIAN THERMAL RESERVOIR IS GENERALLY ABOUT 1-2M³/H·M; THE WATER ABUNDANCE IN THE FRONT OF THE YAN MOUNTAINS, MIDDLE AND NORTHERN PARTS OF THE FRONT OF THE TAIHANG MOUNTAINS, AND THE CENTRAL AND EASTERN PARTS OF THE CANGXIAN ARCH AND THE NANGONG DEPRESSION-MINGHUA UPLIFT-DAYING DEPRESSION BELT IN THE LINQING DEPRESSION IS SMALL, GENERALLY LESS THAN 1M³/H·M; THE WATER ABUNDANCE IN THE NINGJIN UP-SHUDU DEPRESSION-XINHE UPLIFT BELT IN THE LINQING DEPRESSION, THE SOUTHEAST OF GUANGZONG UPLIFT, THE EAST OF GUCHENG UP, AND THE NORTHEAST AND EAST OF CANGXIAN ARCH AND CHENNING ARCH IS LARGE, GENERALLY GREATER THAN 2M³/H·M. THE WATER ABUNDANCE IS AFFECTED MANY FACTORS SUCH AS FAULT TECTONICS, OVERLYING STRATA, RESERVOIR ROCK PROPERTIES, RESERVOIR BURIAL DEPTH, AND HYDROCHEMISTRY. WHEN THE BURIAL DEPTH OF THE TOP BOUNDARY THE RESERVOIR DOES NOT EXCEED 1500M AND THE THICKNESS OF THE OVERLYING CARBONIFEROUS-PERMIAN STRATA DOES NOT EXCEED 400M, THE ABUNDANCE IS BETTER IN THE AREA COVERED BY THE CARBONIFEROUS-PERMIAN STRATA. FOR NON-CARBONIFEROUS-PERMIAN COVERED AREAS, THE WATER ABUNDANCE IS BETTER THE BURIAL DEPTH OF THE TOP BOUNDARY OF THE RESERVOIR DOES NOT EXCEED 2500M. THE WATER ABUNDANCE OF THE MIDDLE ORDOVICIAN IS BETTER THAN THAT OF THE LOWEROVICIAN AND CAMBRIAN; RNA/RCL IS POSITIVELY CORRELATED WITH THE WATER ABUNDANCE, RCL/RCA IS POSITIVELY CORRELATED WITH THE WATER ABUNDANCE IN THE FORM OF A, AND RCL/RHCO₃ IS NEGATIVELY CORRELATED WITH THE WATER ABUNDANCE IN THE FORM OF AN EXPONENT. IT IS PRELIMINARILY INFERRED THAT THE WATER ABUNDANCE IN THE YAN MOUNTAINS, THE TAIHANG MOUNTAINS FRONT, AND THE EASTERN COASTAL AREAS, WHICH ARE LOCATED IN THE RECHARGE AREA, IS GENERALLY POOR, WHILE THE WATER ABUNDANCE IN THE CENTRAL PART OF THE HEI PLAIN, WHICH IS LOCATED IN THE RUNOFF AREA OR DISCHARGE AREA, IS BETTER.