Due to territorial condition and available land in Iran cities, Stabilization Ponds are one of the best choices for wastewater treatment. Studies whole the world indicates that treated water from a well design pond is more reliable than other systems. The other point for accepting this system is related to low cost of installation and operation. The present study is about Khomein city of stabilization ponds by investigating an interference study of any analysis- …. . Samples are taken from row wastewater and effluent of ponds and wastewater treatment system by random. Tests of numbering of Colifourms and Nematods which are include PH, BOD5, COD, TSS, TDS, TS, DO have done. Correlation and Variance medium is used for analyzing of data. Results designed by Matlab and Excel graph. For chemical-physics and Coliform and Nematods tests 366 samples are taken. This study shows that there is a meaningful relation between temperature and surface load and retention time in removal of BOD,COD,COLIFORMS. (pvalu>0.05). Speed wind, evaporation, sunny days and rainy days in statistic analysis shows that stabilization pond in Khomein which are used in cold weather extremely impressed of natural parameters. Comparison of effluent result with standards shows that effluent water is usable for irrigation of parks Manuscript profile