Industry of Banking specially Bank of People Credit (BPR), as one of penopang of aconomics wheel, representing business running effort nya pursuant to carefulness principle. Principally this the expected can give guarantee of security to fund kept by a society, good through saving, deposit, and also forms of other deposit. Along o fund of masyarakat require security guarantee, hence this business sell service pursuant to belief from society that fund kept will be well guaranted is security, particularly again will get advantage from flower for deposit by client or cutomer. Research to test hypothesis for the purpose of agreing or strengthening hypothesis on the chance of, what in the end can strengthen theory of taken as as stepping. This Research population is all client PD. BPR-BKK Demak amounting to 5075 one who is taken as sample of a number of 98 people by using Way of intake sample by though non random sampling that is use convenience sampling. While technique analyse data used by Regresi Doubled Linear By Path Analysis. Conclusion from this research is 1) existence of Influence of quality of service to satisfaction of client of PD BPR BKK Demak. So that improvement of quality of service will have an effect on to improvement of satisfaction of client of PD BPR BKK 2) Existance of Influence of expectation of client to satisfaction of client of PD BPR-BKK Demak earn, so that improvement of expectation of client have an effect on to improvement of satisfaction of client of PD BPR-BKK Demak 3) There are influence of satisfaction of client to loyalitas of client of provable PD BPR-BKK Demak, so that each;every improvement of satisfaction of client have an effect on to improvement of loyalitas of client of PD BPR-BKK Demak 4) Existenceof direct Influence of quality off service to loyalitas of client of PD BPR-BKK of regency of Demak earn, so that improvement of quality of service have an effect on to improvement of loyalitas of client of PD BPR-BKK Demak 5) Existance of direct Influence of expectation of client to loyalitas of client PD BPR-BKK regency of provable Demak. Hence every improvement of expectation of client have an effect on to improvement of loyalitas of client of PD BPR-BKK Demak 6) From result of calculation by SPSS 16.00 knowable result of from R2 of equel to 0,899 so that can be said that by contribution from free variable (quality of service and client expectation) to variable trussed (client satisfaction) big, because value from R2 come near value 1 and equal to 0,101 by other variable outside model regresi. At secondary equation from result of calculation by SPSS 16.00 knowable result of from R2 of equal to 0,936 so that can be said that by contribution from free variable (quality of service and client expectation) to variable trussed (loyalitas client) big, because value from R2 come near value 1 and equal to 0,064 influenced by other;dissimilar variable outside model regresi.