The present research work is about “Curricular planning and its influence on the development of the English Language Basic skills at Pio Jaramillo High School. Night Section. Academic Year 2009-2010”. The lack of a good planning by part of teachers have not let improve the students’ knowledge of the English Language. We know that in most public High Schools the macro-curriculum is represented by the book “Our World Through English” which is based in our reality and includes a communicative methodology that focus on the development of competences. However there are problems with the High School students because they do not manage the English Language. There could be different kind of reasons but which have addressed us to be involved in the present research work is the lack of planning considering the meso and micro-planning inside the English teaching process. For these reasons the problem that moved us to develop this work was: How does the curricular planning affect the development of the four basic linguistic skills of the English language of the students at “Pio Jaramillo Alvarado” High School?.Night section. School year 2009-2010. The specific objectives that were related to the present research are: To characterize the ways of mesoplanning that the teachers elaborate to develop the four basic linguistic skills of the English Language and to explain the relationship of the microplanning with the development of the four basic linguistic skills of the English Language of the students at “Pío Jaramillo Alvarado”, High School Night Section. School Year 2009-2010.