A heterotrophic nitrifying strain was isolated from Yellow River Delta saline-alkali soil, and its morphology, physiochemical properties, 16S rDNA sequence, and ammonia nitrogen degradation ability were examined. The results showed that this bacteria is rod, gram-negative, can use glucose, sucrose as carbon source for growth, and its optimum pH is 9. Its 16S rDNA sequence indicated 99% similarity with Pseudomonas putida（D85992）. Based on the above results, this strain was believed to be a member of genus Pseudomonas and named Pseudomonas sp. SKDP-1. This strain showed high ammonia nitrogen degrading abilities of 49.5%, 34% and 32.8% with sodium citrate, glucose and sucrose as its carbon sources, respectively, and suggesting SKDP-1 has a good application prospect for nitrogen cycle in saline-alkali soil.