The report showed a group of formula ’in estimating digitalis concentration in plasma which depends on the mechanism of the linear system analysis by several of important pharmacokinetic parameters in the condition of primary pharmacokinetic theory. Treating the parameters by. program calculation with scientific calculator

it possesses the merits in calculating simply . chart and expressing results rapidly and accurately. Ths pharmacokinetic chart of digitalis can be analysed and studied by drawing the Q-T curve. The curve showed quantitively that digitalis might be safer than

digitoxin. Maintenance method is better than traditional load method and taking a little amount of drug separately is much more effective than taking a large amount at one time. Therefore

the modified program which possessed more merits was presented