IS-LM methodology was not developed by Hicks alone. Hicks, together with Harrod and Meade jointly contributed to the idea of general equilibrium analysis of products and money markets which were separated treated by Keynes in his General Theory. In order to honor the contribution of the other two economists, we suggested that Hicksian IS-LM framework be renamed Harrod-Hicks-Meade IS-LM model. In IS-LM graphical analysis, the slopes of IS-LM curves and the effectiveness of fiscal and monetary policy are closed related. This thesis has surveyed domestic¡]in Chinese¡^and international¡]in English¡^economics textbooks thoroughly on this matter and discovered that the mistakes are often made or not even mentioned at all. The slope of LM¡]IS¡^curve is determined by interest rate factor , Li¡]Ii¡^and income factor, Ly¡]Cy¡^. If the interest rate factor causes the slopes of two LM¡]IS¡^curves to differ, the expansionary monetary¡]fiscal¡^policy will make LM¡]IS¡^curves horizontal shift to the right. As a result, monetary¡]fiscal¡^policy will be more effective if the LM¡]IS¡^curve is steeper. On the contrary, if the income factor is the cause of the different slopes, the same policy will make LM¡]IS¡^curves shift right vertically. Monetary¡]fiscal¡^policy will be more effective if the LM¡]IS¡^curve is flatter . Once Pigou Effect is present, the aggregate demand curve will become flatter. As a result, monetary¡]fiscal¡^ policy is more¡]less¡^effective than without. Hence, monetary policy is relatively more effective than fiscal policy. In general, a policy-induced shift of aggregate demand curve can¡¦t adopt the horizontal moving method, specifically, for monetary policy, we have to adopt the vertical moving method. As for fiscal policy, the vertical moving method should be adopted , if and only if the income factor causes the different slopes of aggregate demand curves. Neither horizontal nor vertical shift in aggregate demand can be taken for the case when interest rate is the reason leading to the different slopes of aggregate demand curves.