Based on the Logistic-map

an optimized method of generating the spread-spectrum sequences was proposed.An initial value was given and iterated in the Logistic map

then L bit qualification was done to every point

in this way

new spread spectrum sequence would be achieved by shorten.It was compared with conventional chaotic code and Gold code and finally simulated in the DS-CDMA systems.Experiment results show that the iterative times are reduced

the calculating speed is improved

the spread-spectrum sequences can be reshaped with any length and the number of these sequences is larger than Gold sequence in being.The best quantification order is got too.