Much amount of solid waste disposed from human communities, daily. Considerable part of these solids is organic waste that recycling and utilization of it by miscellaneous methods to holdup of damage to environment and maintenance of resources and energy is noteworthy for human. One of suitable methods for disposal of these wastes is production of organic fertilizer by use of vermicompost method which with application of red worms' properties helps to change and reforming the organic solid waste to organic fertilizer. Gold of this study was determination influence of worm population on pH and C/N ratio, which are important factors in compost quality, and rate of process progressing. In this study we use Eisenia Foetida species and we set 5 process pot including 1 blank (with no worm) and 4 pots with different number of worms and pH, C/N ratio and process rate was survived in these pots. Results didn't show significant influence of worm population on pH (p-value>0.05), this issue indicate that, increasing of worm's population has not effective influence in pH changes. But, average of pH in pots with more worms was smaller. A significant relationship had seen between worm's population and C/N ration. In influencing on C/N ratio the aggregations of 0 and 6 worms didn't showed a significant difference. But, there was significant difference among 0 worm and other aggregations, more than 6 worms, in C/N ration. The least C/N ration was in the pot with 18 worms that pose it in B class of compost standard during a month of composting process. The most rate of process obtained in aggregation of 18 worms in 70gr food waste.