P Paper sludge is a type of waste that comes from pulp and paper industri, where it is produced 10-20 tons a day (anonymous, 2001). This type of waste is nonnally stacked or piled up to be used as land.till, yet this waste has not been used optimally and as a result effects the enviromnent (health and higiene). Paper slugde is a organic material that contains high cellulose, which makes it used as fertilizer by going through a process called fermi-fertilizer. The purpose of this research is know preparation process of paper sludge in to becoming fenni-fertilizer, and to know the volume of cow waste that is used to make quality fertilizer, .In this research 2 kg of mixture media, containing of paper sludge and oow waste. Six types of mixtures are used containing 5%, 10%, 20%, 400/0, SO% and 100% paper• sludge, each tested in three containers. AS a decomposer a non-local earth worm species named Lumbrlcus rubellus is used, agip.g 1 month old, as much as 2S grams for each container. Its incubation period is 2 weeks and is continued by a composting period of 6 weeks. Through this experiment obs tion ~eriediCal (O,S; l; 2 ; 4 and 6 weeks) of. temperature, moisture, and pH was observed. At the end of the experiment measurements of the amount of hume and bacteilalization of earth wo , in fermi-fertilizer was obeserved and taken as resmt. The method used to appoint the 8ll101D1t of macro and micro hume laser X-Ray: using 109Cd spectrometer, to agp int C elements by its dryprotions and N element by using ~jel~, UV\ .... visible spectrometerwas used to observethe amount of P available, and also K~l~ueby using NILOAC pH 7. •Result of this research showed mat paper sludge can be used as fermi-fertili7.er byusing a mixture of cow waste of more than 60%. The quality from this fenni-fertilizer was almost balanced to fermi-fertilizer from Ragunan and Amolum. Also optimal fertilizer was able to achieve by a mixture of. paper sludge, not more than 40%.Chaiacteristics of this femu-fertilizer is that it bas brown blackish texture, smooth structure, and coumy (crumbles), temperature of 23,36 - 23,77 °C, moistme level of SS,06 - SS,46 %, acid level (pH level) of 6,27 - 6,60, KTK value ranging from 33,28 -69,4S me/100 gr, and C/N amount of 8-12. Minerals contained in this fermi-fertilizer(base on experiment result) was 2,260 - 3,750 % N, 2,936 - 5,475 % K, 218,100 -670,400 % P, 0,025 - l, 780 % Ca, 1,570 - 2,020 % F~ 0,125 - 0,190 % Mn, and 273 -412 ppm Zn. A mixture of paper sludge and cow waste can also be used as growing media and bacterialization of earth worms, although the amount of paper sludge can notbe more than 20%, in order to increase the value amount of earth worms as much as 66,32-196,8 %.